SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0469e0194027ca0ee3abd316b591501649d07465d334823521a5634a7c908c2a' 
  AND token = 'X+Z58tugtD/6Knp+glGSAugYZOije7tyH71AzVX3wKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}